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Spin-ordering quantum transitions of superconductors in a magnetic field



Spin-ordering quantum transitions of superconductors in a magnetic field



Physical Review Letters 87(6): 067202



We argue that recent neutron scattering measurements by Lake et al. [Science 291, 1759 (2001)] of the spin excitation spectrum of La(2-delta)Sr(delta)CuO4 in a magnetic field can be understood in terms of proximity to a phase with co-existing superconductivity and spin density wave order. We present a general theory for such quantum transitions, and argue that their low energy spin fluctuations are controlled by a singular correction from the superflow kinetic energy, acting in the region outside the vortex cores. We propose numerous experimental tests of our theory.

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Accession: 047415885

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PMID: 11497851

DOI: 10.1103/PhysRevLett.87.067202


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